The GPH is a wonderful helicopter, I really regret selling mine. If I were you,
however, I'd wait for the new Sceadu 50 to come out. It looks to be a great
helicopter from all I've seen and should have all the things that make Hirobos
such great helicopters.
Back to the GPH though... I had the aftermarket tube drive which worked great.
I have heard that some people thought there is insufficient tail authority in
one direction on the tail (shaft driven only) but I never found this to be the
case. As the tube drive is a very expensive upgrade, I'd get the belt if I had
to do it all over again.
Good luck with whatever you do.
1. F.S. GPH 346
4. GPH 346
10. Hirobo GPH 346